Ubiquiti EdgeRouter NameSilo Dynamic DNS

NameSilo_DDNS.sh

#!/bin/bash
# For Ubiquiti EdgeOS
# This script will set the NameSilo ip address to the router's external ip address
# Place the file in /etc/cron.hourly

# Domain name:
DOMAIN="mydomain.tld";

# Host name (subdomain). Optional. If present, must end with a dot (.)
HOST="subdomain.";

# APIKEY obtained from Namesilo:
APIKEY="12345";

#----- Stop Editing -----#

# Saved history pubic IP from last check
IP_FILE="/var/tmp/MyPubIP";

# Get the current public IP
CUR_IP="$(show interfaces ethernet | grep "^eth0" | grep -oP '([0-9]{1,3}\.){3}[0-9]{1,3}')";

# Check file for previous IP address
if [ -f $IP_FILE ]; then
  KNOWN_IP=$(cat $IP_FILE);
else
  KNOWN_IP='';
fi

# See if the IP has changed
if [ "$CUR_IP" != "$KNOWN_IP" ]; then
  echo $CUR_IP > $IP_FILE;

  # Get DNS record id from Namesilo:
  curl -s "https://www.namesilo.com/api/dnsListRecords?version=1&type=xml&key=$APIKEY&domain=$DOMAIN" > $DOMAIN.xml 
  RECORD_ID=`xmllint --xpath "//namesilo/reply/resource_record/record_id[../host/text() = '$HOST$DOMAIN' ]" $DOMAIN.xml | grep -oP '(?<=<record_id>).*?(?=</record_id>)'`
  
  # Set DNS record in Namesilo:
  curl -s "https://www.namesilo.com/api/dnsUpdateRecord?version=1&type=xml&key=$APIKEY&domain=$DOMAIN&rrid=$RECORD_ID&rrhost=$HOST&rrvalue=$CUR_IP&rrttl=3600"
fi

exit 0